A Complete Explanation in Clear, Simple Language By The Found of Psychoanalysis, Sigmund Freud This book is the cornerstone of all pscyoanalysis. Introduction to Psychoanalysis or Introductory Lectures on Psycho-Analysis (German: Vorlesungen zur Einf hrung in die Psychoanalyse) is a set of lectures given by Sigmund Freud 1915-17 (published 1916-17), which became the most popular and widely translated of his works. The 28 lectures offered an elementary stock-taking of his views of the unconscious, dreams, and the theory of neuroses at the time of writing, as well as offering some new technical material to the more advanced reader. Some of the positions outlined here would subsequently be altered or revised in Freud's later work; and in 1932 he offered a second set of seven lectures numbered from 29-35 - New Introductory Lectures on Psychoanalysis - as complement (though these were never read aloud and featured a different, sometimes more polemical style of presentation.)